Replace references to gather town with workadventure

[jfy133]

@netlify /join

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[jfy133]

Only thing I couldn't work out wasn't the logo/icon... I did find an SVG though

[mashehu]

for the logo we can maybe use https://github.com/workadventure/workadventure/blob/f70093311e4e0dc801bd8f1767589c402428e7e9/desktop/electron/assets/icons/logo-white.png

[mashehu]

okay, found an svg version and fixed also the logo in the sidebar

[jfy133]

Completely forgot about this, sorry @mashehu